A man in his 20s was fatally shot Thursday night in Dorchester, police said. Officer James Kenneally, a spokesman for Boston police, said that the call for the shooting on Leyland Street came in at about 7:40 p.m. and that no arrests have been made. Kenneally did not identify the victim. Neighbors told a reporter they heard seven or eight shots. Anyone with information about the shooting can contact homicide detectives at 617-343-4470 or call the anonymous tipline at 1-800-494-TIPS or text the word TIP to CRIME (27463).